Frequencies for first 10,000 rows of popprovm variable in nhamcsopd1997 dataset :

  est. # of |
    inscope |
  providers |
     in psu |
   (masked) |      Freq.     Percent        Cum.
------------+-----------------------------------
        300 |      2,806       28.06       28.06
        306 |        959        9.59       37.65
        348 |      6,086       60.86       98.51
        353 |        149        1.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016